Mechanical equipment capable of operating and electric system thereof

The invention discloses an electric system. The electric system comprises a traction inverter and a traction motor, wherein the traction inverter is used for acquiring direct current from a power supply device through a direct-current bus, and the direct current is converted into three-phase alternating current which is supplied to the traction motor. On the basis, the invention also provides mechanical equipment capable of operating. The mechanical equipment comprises a vehicle containing a power device, and also can be combination of the vehicle containing the power device and a vehicle which does not contain the power device. Compared with electric equipment containing a converter and a power device in the prior art, the electric system has the advantages that the power of the inverter is smaller than that of the converter, the weight is low, needed multiple cooling modes are achieved, the maintenance is convenient, the requirement that the occupying space and the weight of the electric system are reduced is realized, meanwhile, the maintenance convenience and cooling requirement of the electric system can be considered, and light weight and miniaturization of the mechanical equipment capable of operating can be realized, so that the integral balance weight and space distribution can be facilitated.